CVE-2026-90025 (GCVE-0-2026-90025)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-19 08:56
Severity ?
7.7 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: displayport: Fix OOB altmode array index The UCSI displayport driver indexes the connector's port altmode array with the GET_CURRENT_CAM response after checking it is not 0xff. The port altmode array is UCSI_MAX_ALTMODES elements long. If the PPM returns an invalid GET_CURRENT_CAM response above UCSI_MAX_ALTMODES and not equal to 0xff, the kernel may crash with an array index OOB error. Update the UCSI displayport driver to verify the current cam is less than UCSI_MAX_ALTMODES before accessing the port altmode array.
References
Impacted products
Vendor Product Version
Linux Linux Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
Version: af8622f6a585d8d82b11cd7987e082861fd0edd3
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/displayport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8fde7e4a366184e9a6aa95541e52933a73c00a74",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "83f1abd62cc134700ba92e1e2dc650a49a185497",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "1ffed96ef986e2cdf986aa4a4506a5e6dcdf4456",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "58e0ee293ec5e06cacbe3953ad44042f1473dae9",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "ac9f878c468052af6571e8639ab1c3ae040b908f",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "33a81acd2d1d0667d4eff93cb90339fa53e617e8",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "bdaaf3074aedce8f1b173cc363d61cff5f6a585f",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            },
            {
              "lessThan": "04cec690b1fd9d1c4c314b91a10d8c68a3acfe18",
              "status": "affected",
              "version": "af8622f6a585d8d82b11cd7987e082861fd0edd3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/displayport.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "lessThan": "5.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: displayport: Fix OOB altmode array index\n\nThe UCSI displayport driver indexes the connector\u0027s port altmode array\nwith the GET_CURRENT_CAM response after checking it is not 0xff. The\nport altmode array is UCSI_MAX_ALTMODES elements long. If the PPM\nreturns an invalid GET_CURRENT_CAM response above UCSI_MAX_ALTMODES and\nnot equal to 0xff, the kernel may crash with an array index OOB error.\n\nUpdate the UCSI displayport driver to verify the current cam is less\nthan UCSI_MAX_ALTMODES before accessing the port altmode array."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The OOB index is the PPM GET_CURRENT_CAM byte from onboard UCSI firmware (ACPI EC, I2C CCG/STM32G0, pmic_glink, Chrome OS EC), not a USB-C partner or network packet. A compromised PPM can report CONNECTED plus DP partner altmodes and drive enter without a physical plug, matching other firmware-to-kernel scores.\nAC:L - The PPM fully controls the GET_CURRENT_CAM u8; any value in 30-254 (UCSI_MAX_ALTMODES is 30, 0xff is the only sentinel) deterministically indexes port_altmode[] out of bounds with no race or attacker-uncontrollable layout.\nPR:N - UCSI connector-change work, GET_CURRENT_CAM, and dp_altmode_probe\u0027s automatic enter run in kernel context from PPM notifications with no capable() or credential check, so compromised PPM/EC firmware needs no host account.\nUI:N - Partner registration and DisplayPort altmode enter run automatically from PPM connector-change events and dp_altmode_probe scheduled work; no victim must plug a cable, mount media, or open a device node.\nS:U - The out-of-bounds pointer load stays inside the host kernel UCSI DisplayPort driver and connector heap; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - cur is a full u8 used as an index into port_altmode[UCSI_MAX_ALTMODES], so values 30-254 read a kernel pointer from up to about 2KB past the array into adjacent connector/heap memory; that unbounded OOB read scores Confidentiality High.\nI:N - The OOB pointer is only compared to alt to choose 0 versus -EBUSY; it is never written, stored, or used as a write address, so there is no OOB write, use-after-free, or control-flow hijack primitive.\nA:H - An out-of-range CAM can load from unmapped heap, trip KASAN/UBSAN array-index-out-of-bounds, or oops as the fix describes, producing a kernel panic that the PPM can retrigger on each enter."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:56:39.915Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8fde7e4a366184e9a6aa95541e52933a73c00a74"
        },
        {
          "url": "https://git.kernel.org/stable/c/83f1abd62cc134700ba92e1e2dc650a49a185497"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ffed96ef986e2cdf986aa4a4506a5e6dcdf4456"
        },
        {
          "url": "https://git.kernel.org/stable/c/58e0ee293ec5e06cacbe3953ad44042f1473dae9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac9f878c468052af6571e8639ab1c3ae040b908f"
        },
        {
          "url": "https://git.kernel.org/stable/c/33a81acd2d1d0667d4eff93cb90339fa53e617e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdaaf3074aedce8f1b173cc363d61cff5f6a585f"
        },
        {
          "url": "https://git.kernel.org/stable/c/04cec690b1fd9d1c4c314b91a10d8c68a3acfe18"
        }
      ],
      "title": "usb: typec: ucsi: displayport: Fix OOB altmode array index",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90025",
    "datePublished": "2026-09-16T10:33:28.313Z",
    "dateReserved": "2026-09-11T19:38:34.782Z",
    "dateUpdated": "2026-10-19T08:56:39.915Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.